Matlab has a different notion of multidimensional array than J. For example, if an array has shape 2 3 4, then Matlab treats this as 4 matrices, each 2x3, while J treats it as 2 matrices, each 3x4.
I don't think it helps to try to enforce Matlab thinking on J. Also, you should try to set up data and calculations so that you don't have to worry about the shape. In your last post, you want a result of shape 2 by 1 when summing the rows of a 2-row matrix, but this suggests that you are making a mistake, since the natural structure is a 2 element vector, not a 1 column matrix. On Fri, Sep 12, 2014 at 7:38 AM, George Dallas <[email protected]> wrote: > Thank you all for your responses. I think I found a solution that helps me > get the shape of the result I expect by specifying at the beginning of the > J sentence the shape of the result I want. For example, if I want to add > the columns of the expression below and I expect a 2 by 1 vector as a > result I can specify that requirement at the beginning, like so: > > 2 7 $1 > 1 1 1 1 1 1 1 > 1 1 1 1 1 1 1 > > 2 1$(+/"1(2 7 $1)) > 7 > 7 > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
